Write a Program to Demonstrate Working With Dictionaries in Python

Hi, In this article lets learn how to demo the working of dictionary in Python Programming Language.

Dictionary Definition : Dictionary is the set of key value pairs, separated by comma enclosed in two flower braces, having key as unique. Where every value is associated with a key. Key is used as index in dictionary to access value.

Valid data types of keys are string, numbers and tuples. Value can be any data type example, string, numbers, lists, tuple, set, dictionary.

 

 

 

Example :

Create Empty dictionary

basket = dict()

Create Dictionary Containing Subjects and Marks Scored by Student

subjects = {"Science": 50, "Mathematics" : 70, "English" : 57}

Below is the Program to Demonstrate Working With Dictionaries in Python

This program is divided in to four section, Create, Read, Update and Delete (CRUD) secitions of dictionary. Where we first try to create dictionary, Read the dictionary, Update and finally Delete the Dictionary.

 

Phase 1 : Create a Dictionary of fruits with their costs.

 

fruits = {"apple" : 150, "banana" : 50, "orange" : 40}

 

Phase 2 : Read the dictionary by printing fruits in store with their costs

 

print("\nBelow is the cost of fruits : ")

for key, value in fruits.items():

    print(f"Fruits : {key} Costs : {value}")

Phase 3 : Update the fruits with Strawberry cost 100 and print Dictionary

print("\nAdding Strawberry to Store Items")

fruits["strawberry"] = 100

 

print("\nBelow is the cost of fruits : ")

for key, value in fruits.items():

    print(f"Fruits : {key} Costs : {value}")

 

 

Phase 4a : Assuming Apple got over in Store Delete the Apple key and display menu items

print("\nDeleting apple from store")
del fruits["apple"]
for key, value in fruits.items():
    print(f"Fruits : {key} Costs : {value}")

 

Phase 4b : Delete all the fruits from store, using clear dictionary.

fruits.clear()

 

 

Final Program : 

fruits = {"apple" : 150, "banana" : 50, "orange" : 40}

 

print("\nBelow is the cost of fruits : ")

for key, value in fruits.items():

    print(f"Fruits : {key} Costs : {value}")

 

print("\nAdding Strawberry to Store Items")

fruits["strawberry"] = 100

 

print("\nBelow is the cost of fruits : ")

for key, value in fruits.items():

    print(f"Fruits : {key} Costs : {value}")

print("\nDeleting apple from store")
del fruits["apple"]
for key, value in fruits.items():
    print(f"Fruits : {key} Costs : {value}")

 

fruits.clear()

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